select->from( array('hfh' => $this->prefix . 'flappinghistory'), array() )->join( array('ho' => $this->prefix . 'objects'), 'ho.object_id = hfh.object_id AND ho.is_active = 1 AND ho.objecttype_id = 1', array() ); $this->select->where('hfh.event_type = 1001'); $this->joinedVirtualTables['flappinghistory'] = true; $this->columnMap['flappinghistory']['type'] = '(\'flapping_deleted\')'; } }